C8051F336 Datasheet, PDF (173/234 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F336/7/8/9
Table 22.1. Timer Settings for Standard Baud Rates
Using The Internal 24.5 MHz Oscillator
Frequency: 24.5 MHz
Target Baud Rate Oscilla- Timer Clock
Baud Rate % Error tor Divide Source
(bps)
Factor
SCA1–SCA0
(pre-scale
select)¹
230400
–0.32%
106
SYSCLK
XX²
115200
–0.32%
212
SYSCLK
XX
57600
0.15%
426
SYSCLK
XX
28800
–0.32%
848
SYSCLK/4
01
14400
0.15%
1704 SYSCLK/12
00
9600
–0.32%
2544 SYSCLK/12
00
2400
–0.32%
10176 SYSCLK/48
10
1200
0.15%
20448 SYSCLK/48
10
Notes:
1. SCA1–SCA0 and T1M bit definitions can be found in Section 24.1.
2. X = Don’t care.
T1M^{1 Timer 1}
Reload
Value (hex)
1
0xCB
1
0x96
1
0x2B
0
0x96
0
0xB9
0
0x96
0
0x96
0
0x2B
Table 22.2. Timer Settings for Standard Baud Rates
Using an External 22.1184 MHz Oscillator
Target
Baud Rate
(bps)
230400
115200
57600
28800
14400
9600
2400
1200
230400
115200
57600
28800
14400
9600
Baud Rate
% Error
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
0.00%
Frequency: 22.1184 MHz
Oscilla- Timer Clock SCA1–SCA0
tor Divide Source
(pre-scale
Factor
select)¹
96
SYSCLK
XX²
192
SYSCLK
XX
384
SYSCLK
XX
768 SYSCLK / 12
00
1536 SYSCLK / 12
00
2304 SYSCLK / 12
00
9216 SYSCLK / 48
10
18432 SYSCLK / 48
10
96
EXTCLK / 8
11
192 EXTCLK / 8
11
384 EXTCLK / 8
11
768 EXTCLK / 8
11
1536 EXTCLK / 8
11
2304 EXTCLK / 8
11
Notes:
1. SCA1–SCA0 and T1M bit definitions can be found in Section 24.1.
2. X = Don’t care.
T1M^{1 Timer 1}
Reload
Value (hex)
1
0xD0
1
0xA0
1
0x40
0
0xE0
0
0xC0
0
0xA0
0
0xA0
0
0x40
0
0xFA
0
0xF4
0
0xE8
0
0xD0
0
0xA0
0
0x70
Rev. 0.2
173